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19 Cards in this Set
- Front
- Back
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Automatic contrast injector : also called
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* Power injector
* Mechanical injector * Contrast medium injection devices |
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Power injector - why use one ? (8) |
* Faster injection times = better contrast enhancement
* Large bolus injections =single large quantity * Pre-set amount * Consistent injection * Easy reproduction of injection ( settings) * Programmable * Can be used for many indication |
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Configuration |
* Pedestal * Table bracket * Wall mount * Ceiling mount |
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Injector Consists of: (5) |
* Control panel
* Syringes * Warming device * Pressure mechanism * Xray and injection control |
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Control panel |
* Displays injection parameters
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control panel parameters include (5) |
* Rise
* Total volume * Pressure * Delay |
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features of the Syringe |
* Sterile
* 40ml-260ml * Removable * Steel, polycarbonate * Can be disposable |
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features of the Heating device (5) |
* Placed over syringe
* Set to body temp - 37 degrees * Reduces viscosity of contrast * Maintains temperature of preheated contrast medium |
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High Pressure mechanism - |
-electromechanical -options for numbers of turrets = * Single syringe ( head) assembly * Double syringe ( head) assembly * Detachable injector head |
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1. Injection control
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* Injector hand switch * Injector connected to x-ray generator * Can be controlled at injector or from near operator console |
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Injection parameters |
1. Flow rate 2. totally volume 3. rise ( linear rise) 4. injection pressure 5. delay |
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factors that affect flow rate |
* Procedure
* Vessel * Pt type * Nature of disease * Viscosity of contrast medium = Altered by heat or iodine content * Catheter = Length, Diameter, # of holes * Injection pressure ( PSI) |
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flow rate |
* Rate contrast medium injected * Measure in cubic cm per second or mm per sec ( cc/sec or mm/sec) |
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total volume |
* Amount of contrast to be delivered
* = flow rate x injection duration ( V = cc/sec X sec or ml/sec X sec) * Measured in cubic cm |
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rise ( linear rise) |
* Time it takes to reach the desired flow rate * Measured in seconds |
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injection pressure |
* Force needed for a specific dose of contrast medium * Measured in pounds per square inch ( psi) Range of 100 -200 psi * Size of vascular structure, - Smaller vessel, lower injection pressure * Type of catheter |
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delay |
* Can be either injection or x ray delay * Allows for image acquisition to begin before injection of contrast * Useful in DSA where mask image required * Injection of contrast begins before the acquisition of images * Useful in lower extremity arteriography via catheter in abdominal aorta |
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safety features (8) ( for details look in notes) |
* Function monitoring
* volume limiting device * Pressure limiting device * Acceleration regulation * Rate rise * Extravasation/ interstitial injection detection * Air embolism protection * Manual or automatic safety stop |
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set up and operation |
in notes |
